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   1 /*
   2  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 package org.altusmetrum.AltosDroid;
  20
  21 import java.lang.ref.WeakReference;
  22 import java.util.concurrent.TimeoutException;
  23 import java.io.*;
  24 import java.util.*;
  25
  26 import android.app.*;
  27 import android.bluetooth.BluetoothDevice;
  28 import android.bluetooth.BluetoothAdapter;
  29 import android.graphics.Color;
  30 import android.hardware.usb.*;
  31 import android.content.Intent;
  32 import android.content.Context;
  33 import android.os.*;
  34 import android.widget.Toast;
  35 import androidx.core.app.NotificationCompat;
  36
  37 import org.altusmetrum.altoslib_14.*;
  38
  39 public class TelemetryService extends Service implements AltosIdleMonitorListener {
  40
  41         static final int MSG_REGISTER_CLIENT   = 1;
  42         static final int MSG_UNREGISTER_CLIENT = 2;
  43         static final int MSG_CONNECT           = 3;
  44         static final int MSG_OPEN_USB          = 4;
  45         static final int MSG_CONNECTED         = 5;
  46         static final int MSG_CONNECT_FAILED    = 6;
  47         static final int MSG_DISCONNECTED      = 7;
  48         static final int MSG_TELEMETRY         = 8;
  49         static final int MSG_SETFREQUENCY      = 9;
  50         static final int MSG_CRC_ERROR         = 10;
  51         static final int MSG_SETBAUD           = 11;
  52         static final int MSG_DISCONNECT        = 12;
  53         static final int MSG_DELETE_SERIAL     = 13;
  54         static final int MSG_BLUETOOTH_ENABLED = 14;
  55         static final int MSG_MONITOR_IDLE_START= 15;
  56         static final int MSG_MONITOR_IDLE_STOP = 16;
  57         static final int MSG_REBOOT            = 17;
  58         static final int MSG_IGNITER_QUERY     = 18;
  59         static final int MSG_IGNITER_FIRE      = 19;
  60
  61         // Unique Identification Number for the Notification.
  62         // We use it on Notification start, and to cancel it.
  63         private int NOTIFICATION = R.string.telemetry_service_label;
  64         //private NotificationManager mNM;
  65
  66         ArrayList<Messenger> clients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  67         final Handler   handler   = new IncomingHandler(this);
  68         final Messenger messenger = new Messenger(handler); // Target we publish for clients to send messages to IncomingHandler.
  69
  70         // Name of the connected device
  71         DeviceAddress address;
  72         private AltosDroidLink  altos_link  = null;
  73         private TelemetryReader telemetry_reader = null;
  74         private TelemetryLogger telemetry_logger = null;
  75
  76         // Local Bluetooth adapter
  77         private BluetoothAdapter bluetooth_adapter = null;
  78
  79         // Last data seen; send to UI when it starts
  80         private TelemetryState  telemetry_state;
  81
  82         // Idle monitor if active
  83         AltosIdleMonitor idle_monitor = null;
  84
  85         // Igniter bits
  86         AltosIgnite ignite = null;
  87         boolean ignite_running;
  88
  89         // Handler of incoming messages from clients.
  90         static class IncomingHandler extends Handler {
  91                 private final WeakReference<TelemetryService> service;
  92                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  93
  94                 @Override
  95                 public void handleMessage(Message msg) {
  96                         DeviceAddress address;
  97
  98                         TelemetryService s = service.get();
  99                         AltosDroidLink bt = null;
 100                         if (s == null)
 101                                 return;
 102
 103                         switch (msg.what) {
 104
 105                                 /* Messages from application */
 106                         case MSG_REGISTER_CLIENT:
 107                                 s.add_client(msg.replyTo);
 108                                 break;
 109                         case MSG_UNREGISTER_CLIENT:
 110                                 s.remove_client(msg.replyTo);
 111                                 break;
 112                         case MSG_CONNECT:
 113                                 AltosDebug.debug("Connect command received");
 114                                 address = (DeviceAddress) msg.obj;
 115                                 AltosDroidPreferences.set_active_device(address);
 116                                 s.start_altos_bluetooth(address, false);
 117                                 break;
 118                         case MSG_OPEN_USB:
 119                                 AltosDebug.debug("Open USB command received");
 120                                 UsbDevice device = (UsbDevice) msg.obj;
 121                                 s.start_usb(device);
 122                                 break;
 123                         case MSG_DISCONNECT:
 124                                 AltosDebug.debug("Disconnect command received");
 125                                 s.address = null;
 126                                 if (!(Boolean) msg.obj)
 127                                         AltosDroidPreferences.set_active_device(null);
 128                                 s.disconnect(true);
 129                                 break;
 130                         case MSG_DELETE_SERIAL:
 131                                 AltosDebug.debug("Delete Serial command received");
 132                                 s.delete_serial((Integer) msg.obj);
 133                                 break;
 134                         case MSG_SETFREQUENCY:
 135                                 AltosDebug.debug("MSG_SETFREQUENCY");
 136                                 s.telemetry_state.frequency = (Double) msg.obj;
 137                                 if (s.idle_monitor != null) {
 138                                         s.idle_monitor.set_frequency(s.telemetry_state.frequency);
 139                                 } else if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 140                                         try {
 141                                                 s.altos_link.set_radio_frequency(s.telemetry_state.frequency);
 142                                                 s.altos_link.save_frequency();
 143                                         } catch (InterruptedException e) {
 144                                         } catch (TimeoutException e) {
 145                                         }
 146                                 }
 147                                 s.send_to_clients();
 148                                 break;
 149                         case MSG_SETBAUD:
 150                                 AltosDebug.debug("MSG_SETBAUD");
 151                                 s.telemetry_state.telemetry_rate = (Integer) msg.obj;
 152                                 if (s.telemetry_state.connect == TelemetryState.CONNECT_CONNECTED) {
 153                                         s.altos_link.set_telemetry_rate(s.telemetry_state.telemetry_rate);
 154                                         s.altos_link.save_telemetry_rate();
 155                                 }
 156                                 s.send_to_clients();
 157                                 break;
 158
 159                                 /*
 160                                  *Messages from AltosBluetooth
 161                                  */
 162                         case MSG_CONNECTED:
 163                                 AltosDebug.debug("MSG_CONNECTED");
 164                                 bt = (AltosDroidLink) msg.obj;
 165
 166                                 if (bt != s.altos_link) {
 167                                         AltosDebug.debug("Stale message");
 168                                         break;
 169                                 }
 170                                 AltosDebug.debug("Connected to device");
 171                                 try {
 172                                         s.connected();
 173                                 } catch (InterruptedException ie) {
 174                                 }
 175                                 break;
 176                         case MSG_CONNECT_FAILED:
 177                                 AltosDebug.debug("MSG_CONNECT_FAILED");
 178                                 bt = (AltosDroidLink) msg.obj;
 179
 180                                 if (bt != s.altos_link) {
 181                                         AltosDebug.debug("Stale message");
 182                                         break;
 183                                 }
 184                                 if (s.address != null) {
 185                                         AltosDebug.debug("Connection failed... retrying");
 186                                         s.start_altos_bluetooth(s.address, true);
 187                                 } else {
 188                                         s.disconnect(true);
 189                                 }
 190                                 break;
 191                         case MSG_DISCONNECTED:
 192
 193                                 /* This can be sent by either AltosDroidLink or TelemetryReader */
 194                                 AltosDebug.debug("MSG_DISCONNECTED");
 195                                 bt = (AltosDroidLink) msg.obj;
 196
 197                                 if (bt != s.altos_link) {
 198                                         AltosDebug.debug("Stale message");
 199                                         break;
 200                                 }
 201                                 if (s.address != null) {
 202                                         AltosDebug.debug("Connection lost... retrying");
 203                                         s.start_altos_bluetooth(s.address, true);
 204                                 } else {
 205                                         s.disconnect(true);
 206                                 }
 207                                 break;
 208
 209                                 /*
 210                                  * Messages from TelemetryReader
 211                                  */
 212                         case MSG_TELEMETRY:
 213                                 s.telemetry((AltosTelemetry) msg.obj);
 214                                 break;
 215                         case MSG_CRC_ERROR:
 216                                 // forward crc error messages
 217                                 s.telemetry_state.crc_errors = (Integer) msg.obj;
 218                                 s.send_to_clients();
 219                                 break;
 220                         case MSG_BLUETOOTH_ENABLED:
 221                                 AltosDebug.debug("TelemetryService notes that BT is now enabled");
 222                                 address = AltosDroidPreferences.active_device();
 223                                 if (address != null && !address.address.startsWith("USB"))
 224                                         s.start_altos_bluetooth(address, false);
 225                                 break;
 226                         case MSG_MONITOR_IDLE_START:
 227                                 AltosDebug.debug("start monitor idle");
 228                                 s.start_idle_monitor();
 229                                 break;
 230                         case MSG_MONITOR_IDLE_STOP:
 231                                 AltosDebug.debug("stop monitor idle");
 232                                 s.stop_idle_monitor();
 233                                 break;
 234                         case MSG_REBOOT:
 235                                 AltosDebug.debug("reboot");
 236                                 s.reboot_remote();
 237                                 break;
 238                         case MSG_IGNITER_QUERY:
 239                                 AltosDebug.debug("igniter query");
 240                                 s.igniter_query(msg.replyTo);
 241                                 break;
 242                         case MSG_IGNITER_FIRE:
 243                                 AltosDebug.debug("igniter fire");
 244                                 s.igniter_fire((String) msg.obj);
 245                                 break;
 246                         default:
 247                                 super.handleMessage(msg);
 248                         }
 249                 }
 250         }
 251
 252         /* Handle telemetry packet
 253          */
 254         private void telemetry(AltosTelemetry telem) {
 255                 AltosState      state;
 256
 257                 state = telemetry_state.get(telem.serial());
 258                 if (state == null)
 259                         state = new AltosState(new AltosCalData());
 260                 telem.provide_data(state);
 261                 telemetry_state.put(telem.serial(), state);
 262                 telemetry_state.quiet = false;
 263                 if (state != null) {
 264                         AltosPreferences.set_state(state,telem.serial());
 265                 }
 266                 send_to_clients();
 267         }
 268
 269         /* Construct the message to deliver to clients
 270          */
 271         private Message message() {
 272                 if (telemetry_state == null)
 273                         AltosDebug.debug("telemetry_state null!");
 274                 return Message.obtain(null, AltosDroid.MSG_STATE, telemetry_state);
 275         }
 276
 277         /* A new friend has connected
 278          */
 279         private void add_client(Messenger client) {
 280
 281                 clients.add(client);
 282                 AltosDebug.debug("Client bound to service");
 283
 284                 /* On connect, send the current state to the new client
 285                  */
 286                 send_to_client(client);
 287                 send_idle_mode_to_client(client);
 288
 289                 /* If we've got an address from a previous session, then
 290                  * go ahead and try to reconnect to the device
 291                  */
 292                 if (address != null && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 293                         AltosDebug.debug("Reconnecting now...");
 294                         start_altos_bluetooth(address, false);
 295                 }
 296         }
 297
 298         /* A client has disconnected, clean up
 299          */
 300         private void remove_client(Messenger client) {
 301                 clients.remove(client);
 302                 AltosDebug.debug("Client unbound from service");
 303
 304                 /* When the list of clients is empty, stop the service if
 305                  * we have no current telemetry source
 306                  */
 307
 308                  if (clients.isEmpty() && telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED) {
 309                          AltosDebug.debug("No clients, no connection. Stopping\n");
 310                          stopSelf();
 311                  }
 312         }
 313
 314         private void send_to_client(Messenger client) {
 315                 Message m = message();
 316                 try {
 317                         client.send(m);
 318                 } catch (RemoteException e) {
 319                         AltosDebug.error("Client %s disappeared", client.toString());
 320                         remove_client(client);
 321                 }
 322         }
 323
 324         private void send_to_clients() {
 325                 for (Messenger client : clients)
 326                         send_to_client(client);
 327         }
 328
 329         private void send_idle_mode_to_client(Messenger client) {
 330                 Message m = Message.obtain(null, AltosDroid.MSG_IDLE_MODE, idle_monitor != null);
 331                 try {
 332                         client.send(m);
 333                 } catch (RemoteException e) {
 334                         AltosDebug.error("Client %s disappeared", client.toString());
 335                         remove_client(client);
 336                 }
 337         }
 338
 339         private void send_idle_mode_to_clients() {
 340                 for (Messenger client : clients)
 341                         send_idle_mode_to_client(client);
 342         }
 343
 344         private void send_file_failed_to_client(Messenger client, File f) {
 345                 Message m = Message.obtain(null, AltosDroid.MSG_FILE_FAILED, f);
 346                 try {
 347                         client.send(m);
 348                 } catch (RemoteException e) {
 349                         AltosDebug.error("Client %s disappeared", client.toString());
 350                         remove_client(client);
 351                 }
 352         }
 353
 354         public void send_file_failed_to_clients(File f) {
 355                 for (Messenger client : clients)
 356                         send_file_failed_to_client(client, f);
 357         }
 358
 359         private void telemetry_start() {
 360                 if (telemetry_reader == null && idle_monitor == null && !ignite_running) {
 361                         telemetry_reader = new TelemetryReader(altos_link, handler);
 362                         telemetry_reader.start();
 363                 }
 364         }
 365
 366         private void telemetry_stop() {
 367                 if (telemetry_reader != null) {
 368                         AltosDebug.debug("disconnect(): stopping TelemetryReader");
 369                         telemetry_reader.interrupt();
 370                         try {
 371                                 telemetry_reader.join();
 372                         } catch (InterruptedException e) {
 373                         }
 374                         telemetry_reader = null;
 375                 }
 376         }
 377
 378         private void disconnect(boolean notify) {
 379                 AltosDebug.debug("disconnect(): begin");
 380
 381                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 382                 telemetry_state.address = null;
 383
 384                 if (idle_monitor != null)
 385                         stop_idle_monitor();
 386
 387                 if (altos_link != null)
 388                         altos_link.closing();
 389
 390                 stop_receiver_voltage_timer();
 391
 392                 telemetry_stop();
 393                 if (telemetry_logger != null) {
 394                         AltosDebug.debug("disconnect(): stopping TelemetryLogger");
 395                         telemetry_logger.stop();
 396                         telemetry_logger = null;
 397                 }
 398                 if (altos_link != null) {
 399                         AltosDebug.debug("disconnect(): stopping AltosDroidLink");
 400                         altos_link.close();
 401                         altos_link = null;
 402                         ignite = null;
 403                 }
 404                 telemetry_state.config = null;
 405                 if (notify) {
 406                         AltosDebug.debug("disconnect(): send message to clients");
 407                         send_to_clients();
 408                         if (clients.isEmpty()) {
 409                                 AltosDebug.debug("disconnect(): no clients, terminating");
 410                                 stopSelf();
 411                         }
 412                 }
 413         }
 414
 415         private void start_usb(UsbDevice device) {
 416                 AltosUsb        d = new AltosUsb(this, device, handler);
 417
 418                 if (d != null) {
 419                         disconnect(false);
 420                         altos_link = d;
 421                         try {
 422                                 connected();
 423                         } catch (InterruptedException ie) {
 424                         }
 425                 }
 426         }
 427
 428         private void delete_serial(int serial) {
 429                 telemetry_state.remove(serial);
 430                 AltosPreferences.remove_state(serial);
 431                 send_to_clients();
 432         }
 433
 434         private void start_altos_bluetooth(DeviceAddress address, boolean pause) {
 435                 if (bluetooth_adapter == null || !bluetooth_adapter.isEnabled() || address.address == null)
 436                         return;
 437
 438                 disconnect(false);
 439
 440                 // Get the BluetoothDevice object
 441                 BluetoothDevice device = bluetooth_adapter.getRemoteDevice(address.address);
 442
 443                 this.address = address;
 444                 AltosDebug.debug("start_altos_bluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress());
 445                 altos_link = new AltosBluetooth(device, handler, pause);
 446                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTING;
 447                 telemetry_state.address = address;
 448                 send_to_clients();
 449         }
 450
 451         private void start_idle_monitor() {
 452                 if (altos_link != null && idle_monitor == null) {
 453                         telemetry_stop();
 454                         idle_monitor = new AltosIdleMonitor(this, altos_link, true, false);
 455                         idle_monitor.set_callsign(AltosPreferences.callsign());
 456                         idle_monitor.set_frequency(telemetry_state.frequency);
 457                         telemetry_state.idle_mode = true;
 458                         idle_monitor.start();
 459                         send_idle_mode_to_clients();
 460                 }
 461         }
 462
 463         private void stop_idle_monitor() {
 464                 if (idle_monitor != null) {
 465                         try {
 466                                 idle_monitor.abort();
 467                         } catch (InterruptedException ie) {
 468                         }
 469                         idle_monitor = null;
 470                         telemetry_state.idle_mode = false;
 471                         telemetry_start();
 472                         send_idle_mode_to_clients();
 473                 }
 474         }
 475
 476         private void reboot_remote() {
 477                 if (altos_link != null) {
 478                         stop_idle_monitor();
 479                         try {
 480                                 altos_link.start_remote();
 481                                 altos_link.printf("r eboot\n");
 482                                 altos_link.flush_output();
 483                         } catch (TimeoutException te) {
 484                         } catch (InterruptedException ie) {
 485                         } finally {
 486                                 try {
 487                                         altos_link.stop_remote();
 488                                 } catch (InterruptedException ie) {
 489                                 }
 490                         }
 491                 }
 492         }
 493
 494         private void ensure_ignite() {
 495                 if (ignite == null)
 496                         ignite = new AltosIgnite(altos_link, true, false);
 497         }
 498
 499         private synchronized void igniter_query(Messenger client) {
 500                 ensure_ignite();
 501                 HashMap<String,Integer> status_map = null;
 502                 ignite_running = true;
 503                 try {
 504                         stop_idle_monitor();
 505                         try {
 506                                 status_map = ignite.status();
 507                         } catch (InterruptedException ie) {
 508                                 AltosDebug.debug("ignite.status interrupted");
 509                         } catch (TimeoutException te) {
 510                                 AltosDebug.debug("ignite.status timeout");
 511                         }
 512                 } finally {
 513                         ignite_running = false;
 514                 }
 515                 Message m = Message.obtain(null, AltosDroid.MSG_IGNITER_STATUS, status_map);
 516                 try {
 517                         client.send(m);
 518                 } catch (RemoteException e) {
 519                 }
 520         }
 521
 522         private synchronized void igniter_fire(String igniter) {
 523                 ensure_ignite();
 524                 ignite_running = true;
 525                 stop_idle_monitor();
 526                 try {
 527                         ignite.fire(igniter);
 528                 } catch (InterruptedException ie) {
 529                 } finally {
 530                         ignite_running = false;
 531                 }
 532         }
 533
 534         // Timer for receiver battery voltage monitoring
 535         Timer receiver_voltage_timer;
 536
 537         private void update_receiver_voltage() {
 538                 if (altos_link != null && idle_monitor == null && !ignite_running) {
 539                         try {
 540                                 double  voltage = altos_link.monitor_battery();
 541                                 telemetry_state.receiver_battery = voltage;
 542                                 send_to_clients();
 543                         } catch (InterruptedException ie) {
 544                         }
 545                 }
 546         }
 547
 548         private void stop_receiver_voltage_timer() {
 549                 if (receiver_voltage_timer != null) {
 550                         receiver_voltage_timer.cancel();
 551                         receiver_voltage_timer.purge();
 552                         receiver_voltage_timer = null;
 553                 }
 554         }
 555
 556         private void start_receiver_voltage_timer() {
 557                 if (receiver_voltage_timer == null && altos_link.has_monitor_battery()) {
 558                         receiver_voltage_timer = new Timer();
 559                         receiver_voltage_timer.scheduleAtFixedRate(new TimerTask() { public void run() {update_receiver_voltage();}}, 1000L, 10000L);
 560                 }
 561         }
 562
 563         private void connected() throws InterruptedException {
 564                 AltosDebug.debug("connected top");
 565                 AltosDebug.check_ui("connected\n");
 566                 try {
 567                         if (altos_link == null)
 568                                 throw new InterruptedException("no bluetooth");
 569                         telemetry_state.config = altos_link.config_data();
 570                         altos_link.set_radio_frequency(telemetry_state.frequency);
 571                         altos_link.set_telemetry_rate(telemetry_state.telemetry_rate);
 572                 } catch (TimeoutException e) {
 573                         // If this timed out, then we really want to retry it, but
 574                         // probably safer to just retry the connection from scratch.
 575                         AltosDebug.debug("connected timeout");
 576                         if (address != null) {
 577                                 AltosDebug.debug("connected timeout, retrying");
 578                                 start_altos_bluetooth(address, true);
 579                         } else {
 580                                 handler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 581                                 disconnect(true);
 582                         }
 583                         return;
 584                 }
 585
 586                 AltosDebug.debug("connected bluetooth configured");
 587                 telemetry_state.connect = TelemetryState.CONNECT_CONNECTED;
 588                 telemetry_state.address = address;
 589
 590                 telemetry_start();
 591
 592                 AltosDebug.debug("connected TelemetryReader started");
 593
 594                 telemetry_logger = new TelemetryLogger(this, altos_link);
 595
 596                 start_receiver_voltage_timer();
 597
 598                 AltosDebug.debug("Notify UI of connection");
 599
 600                 send_to_clients();
 601         }
 602
 603
 604         @Override
 605         public void onCreate() {
 606
 607                 AltosDebug.init(this);
 608
 609                 // Initialise preferences
 610                 AltosDroidPreferences.init(this);
 611
 612                 // Get local Bluetooth adapter
 613                 bluetooth_adapter = BluetoothAdapter.getDefaultAdapter();
 614
 615                 telemetry_state = new TelemetryState();
 616
 617                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 618                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 619
 620                 telemetry_state.connect = TelemetryState.CONNECT_DISCONNECTED;
 621                 telemetry_state.address = null;
 622
 623                 /* Pull the saved state information out of the preferences database
 624                  */
 625                 ArrayList<Integer> serials = AltosPreferences.list_states();
 626
 627                 telemetry_state.latest_serial = AltosPreferences.latest_state();
 628
 629                 telemetry_state.quiet = true;
 630
 631                 AltosDebug.debug("latest serial %d\n", telemetry_state.latest_serial);
 632
 633                 for (int serial : serials) {
 634                         AltosState saved_state = AltosPreferences.state(serial);
 635                         if (saved_state != null) {
 636                                 AltosDebug.debug("recovered old state serial %d flight %d",
 637                                                  serial,
 638                                                  saved_state.cal_data().flight);
 639                                 if (saved_state.gps != null)
 640                                         AltosDebug.debug("\tposition %f,%f",
 641                                                          saved_state.gps.lat,
 642                                                          saved_state.gps.lon);
 643                                 telemetry_state.put(serial, saved_state);
 644                         } else {
 645                                 AltosDebug.debug("Failed to recover state for %d", serial);
 646                                 AltosPreferences.remove_state(serial);
 647                         }
 648                 }
 649         }
 650
 651
 652         private String createNotificationChannel(String channelId, String channelName) {
 653                 NotificationChannel chan = new NotificationChannel(
 654                                 channelId, channelName, NotificationManager.IMPORTANCE_NONE);
 655                 chan.setLightColor(Color.BLUE);
 656                 chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
 657                 NotificationManager service = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 658                 service.createNotificationChannel(chan);
 659                 return channelId;
 660         }
 661
 662         @Override
 663         public int onStartCommand(Intent intent, int flags, int startId) {
 664                 AltosDebug.debug("Received start id %d: %s", startId, intent);
 665
 666                 // The PendingIntent to launch our activity if the user selects this notification
 667                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 668                                 new Intent(this, AltosDroid.class), 0);
 669
 670                 String channelId =
 671                                 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
 672                                                 ? createNotificationChannel("altosdroid_telemetry", "AltosDroid Telemetry Service")
 673                                                 : "";
 674
 675                 // Create notification to be displayed while the service runs
 676                 Notification notification = new NotificationCompat.Builder(this, channelId)
 677                                 .setContentTitle(getText(R.string.telemetry_service_label))
 678                                 .setContentText(getText(R.string.telemetry_service_started))
 679                                 .setContentIntent(contentIntent)
 680                                 .setWhen(System.currentTimeMillis())
 681                                 .setOngoing(true)
 682                                 .setSmallIcon(R.drawable.am_status_c)
 683 //                              .setLargeIcon(R.drawable.am_status_c)
 684                                 .build();
 685
 686                 // Move us into the foreground.
 687                 startForeground(NOTIFICATION, notification);
 688
 689                 /* Start bluetooth if we don't have a connection already */
 690                 if (intent != null &&
 691                     (telemetry_state.connect == TelemetryState.CONNECT_NONE ||
 692                      telemetry_state.connect == TelemetryState.CONNECT_DISCONNECTED))
 693                 {
 694                         String  action = intent.getAction();
 695
 696                         if (action.equals(AltosDroid.ACTION_BLUETOOTH)) {
 697                                 DeviceAddress address = AltosDroidPreferences.active_device();
 698                                 if (address != null && !address.address.startsWith("USB"))
 699                                         start_altos_bluetooth(address, false);
 700                         }
 701                 }
 702
 703                 // We want this service to continue running until it is explicitly
 704                 // stopped, so return sticky.
 705                 return START_STICKY;
 706         }
 707
 708         @Override
 709         public void onDestroy() {
 710
 711                 // Stop the bluetooth Comms threads
 712                 disconnect(true);
 713
 714                 // Demote us from the foreground, and cancel the persistent notification.
 715                 stopForeground(true);
 716
 717                 // Tell the user we stopped.
 718                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 719         }
 720
 721         @Override
 722         public IBinder onBind(Intent intent) {
 723                 return messenger.getBinder();
 724         }
 725
 726         /* AltosIdleMonitorListener */
 727         public void update(AltosState state, AltosListenerState listener_state) {
 728                 if (state != null)
 729                         AltosDebug.debug("update call %s freq %7.3f", state.cal_data().callsign, state.frequency);
 730                 telemetry_state.put(state.cal_data().serial, state);
 731                 telemetry_state.receiver_battery = listener_state.battery;
 732                 send_to_clients();
 733         }
 734
 735         public void failed() {
 736         }
 737
 738         public void error(String reason) {
 739                 stop_idle_monitor();
 740         }
 741 }